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The quality of ambulatory care in Medicare health maintenance organizations.

S M Retchin and B Brown

Department of Internal Medicine, Medical College of Virginia, Virginia Commonwealth University, Richmond 23298.

The quality of ambulatory care received by Medicare recipients who enrolled in health maintenance organizations (HMOs) was compared to the care received by fee-for-service (FFS) Medicare recipients, in a quasi-experimental, non-randomized design. Both samples were drawn from the four major geographic areas in the country, and included two types of HMO practices: staff/group models, and independent practice associations (IPAs). A panel of expert physicians developed criteria for evaluating ambulatory care, and medical record abstractions using these criteria were performed on 1,590 outpatient records: 777 FFS and 813 HMO (441 staff/group, 372 IPA). While individual items of medical histories and physical examinations were performed most often for staff/group HMO patients and least often in FFS patients, odds ratios (OR) for performance in staff/group HMO patients were particularly large for health maintenance items: tonometry (OR = 8.4), mammography (OR = 2.7), pelvic examination (OR = 5.3), rectal examination (OR = 2.9), fecal occult blood test (OR = 3.3). The results suggest that recommended elements of routine and preventive care are more likely to be performed for Medicare enrollees in staff/group HMOs than in FFS settings.

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On quality of ambulatory care.

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